Ford B0004 OBD-II Trouble Code Definition: B0004 PCM Discrete Input Speed Signal Not Present B0004 Ford OBD-II Trouble CodeDescription: Trouble Code: System: Subsystem: B0004 – (ASE) Body Fuel & Air metering, Auxiliary emission controls DTC Description: Driver Knee Bolster Deployment Control Location: Analysis: Likely Cause: Notes: […]